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2 Sheets-Sheet 1. P. B. DELANY.

TELEGRAPHIG APPARATUS. No. 286,280. Ptnted Oct. 9, 1883.

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(No Model.) 2 SheetsSheet 2.

P. B. DELANY.

TELEGRAPHIO APPARATUS.

'No. 286,280. Patented Oct. 9, 1883.

WITNESSES INVENTOR Patric/i J ,Delan y By. his .dItOI-neg J JZmWR/ M QXAM Ww UNITED STATES PATRICK 13. DELANY, OF. NEW YORK,

n. Y., ASSIGNOR TO THE STANDARD ELECTRIC MANUFACTURING COMPANY, OF SAME PLACE.

TELEGRAPHIC APPARATUS.

SPECIFICATION forming part of Letters Patent No. 286,280, dated October 9, 1833. Application filed' April-14,1893. (x model.)

tory or rapidly-interrupted currents are employed. In the accompanying drawings, Figure 1 a diagrammatic plan view of two stations con- 1 nected by a main line organized for transmis-- sion by means of vibratory currents. Fig. 2

is a detailed view, showing the relay sounder, key, and battery at a single station.

The system of operation disclosed in Fig. 1

is substantially the same as that disclosed in an application of duplex telegraphy'filed simultaneously herewith, serially numbered 91,709, and no claim is herein made, broadly, to such a system. Thatfigure, however, rep- ,2 resents a system of vibratory tclegraphy to which my improved organization of sounders it specially applicable.

At each of the stations X. and Y, I place a circuit-breaker, in this instance shown in the 0 drawings as a vibrating tuned fork. The fork is automatically vibrated by a'local battery and circuit, (indicated by dot-ted lines,) in which'the coils of the battery-magnet A A are placed. This local circuit is made and 5 broken automatically between the platinum contact a on one of the tines of the fork, and a very delicate light platinum contact-finger carried on the end of an insulated pivoted lever, ll. \fhen the fork is started into vibration, its vibration" will be automatically continned by the action of the local battery and magnets, and in order, if necessary, to regulatethe speed of vibration within limits, Iproride the poles of the magnet with adjustable 5 extension-pieces.

ln orderto prevent sparksbetween the plat innm contact a and the spring, I place a' resistance, Rh, in a shunt which runs from the head of the fork to thelever B. The opposite 5o tine of the fork is provided with platinum contactpieces c (7, one on each side, which. alien nately and successively,'as the fork vibrate s, complete the main-line circuit'through the pivoted insulated levers e d and through the lines E D, in each of which is a relay and key- 5 and the main battery. The proper rates of vibration of the forks should, however, depend upon their normal rates, and not upon adjustment or modification of those rates, because it is desirable that the vibrations should be wide and strong, so that the completions of the branch circuits may be entirely clear and independent of each other, as obviously thebest results can be obtained in that way. The organization is identical at both stations, and if 6 the fork at station X vibrates normally-say at a rate of two hundred per second-and that at station Y at a rate of ninety per second, the

circuit at station X will of course be completedthrough the lines E D two hundred times in every second, and at station Y through the lines E D ninety times per second. At station Y the battery Gin the line E is placed with its positive pole to the line, while the battery H in the line E at station X is placed with its positive pole in the line, and the battery I in line D at stat on X, and the battery L in line I at station Y, are placed with their negative poles to thelinc. Under thisorganization two messages may be transmitted either simultaneously in the same direction or simultaneously in opposite directions. Thus if the key connected to thebattery I at station- X is depressed and the forks at both stations are vibrating, as remarked above, the battery I will send two hundred impulses per second into the main line. At station Y the circuit will be completed ninety times per second through both the lines E and D; but the relay in the line E only will be affected, because in that line the battery G is not opposed to the battery I, so if the keyconnectcd with the battery H at station X is operated the current transmitted from that battery will only be effective in the line I). The operation is precisely the same if Y is the transmission end of the line. It will also lie obvious that a message may be sent from stationY simultaneously with one from station X without interference.

There is always a sufficient number of vibrations per second to complete each circuitin which the telepraphic instruments are placed a sufficient number of times to transmit telegraphieally with perfect ease and ac- -relay-armature leaves its back stop, instead of causing the sounder to give a reading-stroke when the rel'ay armature is brought against its front stop, as has heretofore been the case in systems of this character.

' Iii Fig. 1 each of the 'sounders S is arranged in the following manner: The coil .of the sounder is placed in a closed local circuit, but

the poles of the local battery arc-also connecied with the relay-armature and itsback stop. \Vhen, therefore, there isno impulse of electricity in the main line, the relay-armature will be .drawn by its spring against the back, contact, and the local battery will be shunted from the sounder-coil, and the armature of the sounderwill of course be drawn by its spring against its back stop. \Vhen an impulse of electricity,; however, is received, the

relay-armature is drawn away from its back stop, and the moment it leaves that stop the shunt is broken and the current from the local battery traverses the coils of the sounder and causes its armature to give its ordinary downward reading-stroke. As the shunt ou' the local circuit is broken the moment the relay armature leaves its back stop, the subsequent movement'of the relay-armature, or itsvibration or chattering onits front stop, does not affect the sounder. Vith such an organization, therefore, the sounder works as distinct- Iy as if a strong continuous current were used. Of course this special arrangement may be used with equal advantageuponj long Morse circuits, where the electro-motive force at the receiving-station is so diminished by leakage or other causes that the current is too weak to hold the relay-armature firmly in contact with: its front stop against the pull of its spring.

In Fig. 2 I have shown a sounder which, although different in construction and arrange ment of circuit from that just described, operates in the same manner-that is, the ordinary downward reading-stroke upon the sounder is given when the relay-armature leaves its back.) stop. To describe the arrangementillustrated in this figure more in detail, the local-battery circuit is completed through the relay-arma ture, its back stop, and the coil of the sounder. The reading-stroke of the claimed, is reserved.

sounding armature is given by the pull of its spring, .and not by the attraction of the sounder-magnet. \Vhen there is no current on the line, the relay-arg' mature is drawn over againstits back stop by its tension-spring, and the local circuit is completed through the coil of the sounder, and the armature of the sounder is lifted from the sounding-bridge against the tension of its spring by the sounder-magnet. pulse of electricity is received over the line, the relay-armature leaves its back stop, and the moment it leaves that stop the local-sounder circuit is broken, and the sounder-armature is drawn down upon the bridge by the force of the spring. The subsequent vibration of the relay-armature on its front stop, or any movement of it betweenthe front and back stops, will not affect the sounder. It is obvious that such an arrangement is applicableto the \Vhen an imsystem illustrated in Fig. 1, 'or to any system I where vibratory currents are employed.

As above remarked, I am aware that in the organization shown in Fig. 1 the local circuit is shunted. and not broken, and the downward readi ng-strokeof the sounder-armatureis given by the attraction of the sounder magnet,

I which overcomes the pull of the sounder-arma ture spring, and that in Fig. 2 the local circuit 'is not shunt-ed, but is broken, and the readingstroke on the sounder on the sounding-bridge is given by the pull of the spring, and not by the attraction of the magnet. In both organizations, however, the arrangement is such that the sounder gives the ordinary downward reading-stroke when the relay-armatu re leaves its back stop, and not when it makes contact with its front stop.

i 'The right to tile hereafter other applica tions covering, broadly, the. sounder which. gives the springstroke, or any sulqieetsanatter herein shown or described and notfully I claim as my invention V 1. The combination, with a system of telegraphy in which each signal or working-impulse is made up of a series of vibrations or impulses, of a relay and sounder so arranged that the sounder gives its reading-stroke when the i1 lay-armature leaves its back stop. 2. The combination, with a system of telegraphy' in which each signal or working-impulse is made up of a series of v ibrations, of a relay,

a sounder local circuit which is closed when the relay-armature is at rest,-the normally-attracted sounder-armature, and a spring which causes the downward reading-stroke of said armature when the relay-armature leaves its back stop.

In testimony whereof I have hereunto subscribed my name this 12th day of April, A. D. 1883.

PATRICK B. DELANY.

\Vitnesses:

Enwn. A. CALAHAs, H. D. MUNsos. 

